Buggy code:
public class WhileStatement extends Statement { public Expression condition ; public Statement action ; private Label breakLabel ; private Label continueLabel ; int preCondInitStateIndex = - 1 ; int condIfTrueInitStateIndex = - 1 ; int mergedInitStateIndex = - 1 ; public WhileStatement ( Expression condition , Statement action , int s , int e ) { } public FlowInfo analyseCode ( BlockScope currentScope , FlowContext flowContext , FlowInfo flowInfo ) { breakLabel = new Label ( ) ; continueLabel = new Label ( ) ; Constant cst = this . condition . constant ; boolean isConditionTrue = ( cst != ( NotAConstant ) ) && ( ( cst . booleanValue ( ) ) == true ) ; boolean isConditionFalse = ( cst != ( NotAConstant ) ) && ( ( cst . booleanValue ( ) ) == false ) ; cst = this . condition . optimizedBooleanConstant ( ) ; boolean isConditionOptimizedTrue = ( cst != ( NotAConstant ) ) && ( ( cst . booleanValue ( ) ) == true ) ; boolean isConditionOptimizedFalse = ( cst != ( NotAConstant ) ) && ( ( cst . booleanValue ( ) ) == false ) ; preCondInitStateIndex = currentScope . methodScope ( ) . recordInitializationStates ( flowInfo ) ; LoopingFlowContext condLoopContext ; FlowInfo condInfo = flowInfo . copy ( ) . unconditionalInits ( ) . discardNullRelatedInitializations ( ) ; condInfo = this . condition . analyseCode ( currentScope , ( condLoopContext = new LoopingFlowContext ( flowContext , this , null , null , currentScope ) ) , condInfo ) ; LoopingFlowContext loopingContext ; FlowInfo actionInfo ; FlowInfo exitBranch ; <START_BUG> if ( ( ( action ) == null ) || ( ( action . isEmptyBlock ( ) ) && ( ( currentScope . environment ( ) . options . complianceLevel ) <= ( ClassFileConstants . JDK1_3 ) ) ) ) { <END_BUG> condLoopContext . complainOnDeferredChecks ( currentScope , condInfo ) ; if ( isConditionTrue ) { return FlowInfo . DEAD_END ; } else { FlowInfo mergedInfo = condInfo . initsWhenFalse ( ) . unconditionalInits ( ) ; if ( isConditionOptimizedTrue ) { mergedInfo . setReachMode ( FlowInfo . UNREACHABLE ) ; } mergedInitStateIndex = currentScope . methodScope ( ) . recordInitializationStates ( mergedInfo ) ; return mergedInfo ; } } else { loopingContext = new LoopingFlowContext ( flowContext , this , breakLabel , continueLabel , currentScope ) ; if ( isConditionFalse ) { actionInfo = FlowInfo . DEAD_END ; } else { actionInfo = condInfo . initsWhenTrue ( ) . copy ( ) ; if ( isConditionOptimizedFalse ) { actionInfo . setReachMode ( FlowInfo . UNREACHABLE ) ; } } condIfTrueInitStateIndex = currentScope . methodScope ( ) . recordInitializationStates ( condInfo . initsWhenTrue ( ) ) ; if ( ! ( this . action . complainIfUnreachable ( actionInfo , currentScope , false ) ) ) { actionInfo = this . action . analyseCode ( currentScope , loopingContext , actionInfo ) ; } exitBranch = condInfo . initsWhenFalse ( ) ; exitBranch . addInitializationsFrom ( flowInfo ) ; if ( ( ! ( actionInfo . isReachable ( ) ) ) && ( ! ( loopingContext . initsOnContinue . isReachable ( ) ) ) ) { continueLabel = null ; } else { condLoopContext . complainOnDeferredChecks ( currentScope , condInfo ) ; actionInfo = actionInfo . mergedWith ( loopingContext . initsOnContinue . unconditionalInits ( ) ) ; loopingContext . complainOnDeferredChecks ( currentScope , actionInfo ) ; exitBranch . addPotentialInitializationsFrom ( actionInfo . unconditionalInits ( ) ) ; } } FlowInfo mergedInfo = FlowInfo . mergedOptimizedBranches ( loopingContext . initsOnBreak , isConditionOptimizedTrue , exitBranch , isConditionOptimizedFalse , ( ! isConditionTrue ) ) ; mergedInitStateIndex = currentScope . methodScope ( ) . recordInitializationStates ( mergedInfo ) ; return mergedInfo ; } public void generateCode ( BlockScope currentScope , CodeStream codeStream ) { } public void resolve ( BlockScope scope ) { } public StringBuffer printStatement ( int tab , StringBuffer output ) { } public void traverse ( ASTVisitor visitor , BlockScope blockScope ) { } }

Fix:
if ( ( ( action ) == null ) || ( ( action . isEmptyBlock ( ) ) && ( ( currentScope . compilerOptions ( ) . complianceLevel ) <= ( ClassFileConstants . JDK1_3 ) ) ) ) {